Very Urgent - In a Bind - PeachParts Mercedes-Benz Forum

Adriel · #1 12-14-2013, 12:39 PM

Is there anyone in the state of Arizona that I can pay to correct a vacuum leak? I need to leave Wednesday for a road trip.

The issue is the vacuum diagram doesn't have a part number, so not sure which of the two same looking devices have lines going where...

Also, got a leak at the brown line, but can't seem to find where it goes.

jusme · #2 12-14-2013, 12:42 PM

For this trip, as it's urgent, you may think about capping the vacuum before it enters the interior compartment, and keep everything isolated to the engine bay for correct engine/transmission operation. You'll lose some climate, and door locky type comforts, but easier to track down a leak when you've eliminated those areas.

Rockyriver · #3 12-14-2013, 12:42 PM

Not in Arizona. But always post pictures and then maybe someone can tell you
what you need and where to get it.

Adriel · #4 12-14-2013, 12:47 PM

Quote:

Originally Posted by Rockyriver

Not in Arizona. But always post pictures and then maybe someone can tell you
what you need and where to get it.

Already been down that road and no one knew the answer... Figured money might motivate. Rather pay to get her right than pay for airline tickets!

kerry · #5 12-14-2013, 01:02 PM

You can drive this car without vacuum. It's not a big issue. The only issue is shutting it off (hence your comment about the brown line). Plug the yellow line where it goes into the firewall (plug the end towards the pump, not the interior). You won't have vacuum locks on doors, gas tank door, or trunk. Leave the green line since it controls your heating pods and I assume you'll need heat this time of year. Pull the brown line off the shut off valve. Replace it with a long piece of rubber vacuum hose lead out thru the cowl area. Shut the hood. You can now shut off the engine by giving three quick sucks on that vacuum line without opening the hood. (as long as the vacuum diaphragm in the shut off valve is intact). Go on your road trip.

Adriel · #6 12-14-2013, 01:18 PM

Quote:

Originally Posted by kerry

You can drive this car without vacuum. It's not a big issue. The only issue is shutting it off (hence your comment about the brown line). Plug the yellow line where it goes into the firewall (plug the end towards the pump, not the interior). You won't have vacuum locks on doors, gas tank door, or trunk. Leave the green line since it controls your heating pods and I assume you'll need heat this time of year. Pull the brown line off the shut off valve. Replace it with a long piece of rubber vacuum hose lead out thru the cowl area. Shut the hood. You can now shut off the engine by giving three quick sucks on that vacuum line without opening the hood. (as long as the vacuum diaphragm in the shut off valve is intact). Go on your road trip.

Thank you so very much!

I have checked and eliminated any line with a leak, and still have a leak. Now going to check the shut off valve, as only thing I can think of. I made sure when I installed the seal for the booster to be careful and when I undo the the line, get a hiss.

Adriel · #7 12-14-2013, 01:48 PM

Brown line isn't for the vacuum shut off, but the brown and purple. Brown goes to something on the passenger side.

Eliminated the vacuum system, and still has the issue. This is why I need local help...

whunter · #8 12-14-2013, 01:53 PM

Quote:

Originally Posted by Adriel

Is there anyone in the state of Arizona that I can pay to correct a vacuum leak? I need to leave Wednesday for a road trip.

The issue is the vacuum diagram doesn't have a part number, so not sure which of the two same looking devices have lines going where...

Also, got a leak at the brown line, but can't seem to find where it goes.

More definition required.

What forum thread with pictures?

What vacuum diagram, EGR, transmission, shutoff, climate control, central locking???

********************************

The BROWN line is simple:
* From the Large black vacuum pump supply line.
* Through the bulkhead.
* To the steering lock, key lock, vacuum switch.

# From the steering lock, key lock, vacuum switch.
# To the injection pump vacuum shutoff box.

******************************************

Here are more vacuum diagrams that may help you...
300TD W123193 Vacuum System Photos by whunter | Photobucket

.

jay_bob · #9 12-14-2013, 01:55 PM

The brown line going into the passenger compartment goes to the key. In the key switch there is a 3-way valve to control the shutoff actuator.

charmalu · #10 12-14-2013, 02:00 PM

You get a Hiss because it is holding vacuum, the Hiss is air rushing in.

When you add a line to the Vacuum Shut off Valve, use a clear line. If the diaphragm is ruptured inside it, you will get a mouth of eng oil. this way you will see it coming up the clear tube.

If you see no oil, then you know the shut off valve is good.

The brown line connects to the large black supply line between the Vacuum pump and the Brake Booster. this is it`s source of vacuum. the Brown line goes into the passenger compartment, and connects to the Valve on the Ignition/Steering Lock assy. then a second brown line, (which is also connected to the same valve) comes out from the passenger compartment, and connects to the Vacuum Fuel Shut off valve.

When you turn the Key to start the Engine, or to shut off the Engine, this switches Vacuum to shut off the engine, or releases vacuum so the fuel is turned so the Engine starts.

Simple???

Charlie

whunter · #11 12-14-2013, 02:04 PM

Quote:

Originally Posted by Adriel

Brown line isn't for the vacuum shut off, but the brown and purple. Brown goes to something on the passenger side.

Eliminated the vacuum system, and still has the issue. This is why I need local help...

If the brown line is not for shutoff = your system has been seriously altered / hacked.

.

Adriel · #12 12-14-2013, 02:41 PM

Quote:

Originally Posted by whunter

If the brown line is not for shutoff = your system has been seriously altered / hacked.

.

Prove it.

I know it is original without doubt because I have the history and the fact of the lines being the correct lengths and apparent age. Plus, there be no reason to swap brown/purple with brown.

I think I know what I did wrong in testing: shutoff has no vacuum source with all vacuum lines eliminated. Duh!

cooljjay · #13 12-14-2013, 02:55 PM

I would be more then willing to help but i have no spare parts to fix anything that may be broke and i haven,t bought a new mityvac......though i am a little ways away...

Adriel · #14 12-14-2013, 03:06 PM

Quote:

Originally Posted by charmalu

You get a Hiss because it is holding vacuum, the Hiss is air rushing in.

When you add a line to the Vacuum Shut off Valve, use a clear line. If the diaphragm is ruptured inside it, you will get a mouth of eng oil. this way you will see it coming up the clear tube.

If you see no oil, then you know the shut off valve is good.

The brown line connects to the large black supply line between the Vacuum pump and the Brake Booster. this is it`s source of vacuum. the Brown line goes into the passenger compartment, and connects to the Valve on the Ignition/Steering Lock assy. then a second brown line, (which is also connected to the same valve) comes out from the passenger compartment, and connects to the Vacuum Fuel Shut off valve.

When you turn the Key to start the Engine, or to shut off the Engine, this switches Vacuum to shut off the engine, or releases vacuum so the fuel is turned so the Engine starts.

Simple???

Charlie

Thank you so very much Charlie!

Not sure how I missed it...

Well then, must be blind. I thought I was careful in tracing. I can't find the vacuum sheet I printed, P.C. off for repairs, and can't find the enhanced version on here...

So then, can I then say the booster and booster seal are good?